As Ski infers, it really isn't necessary to be that granular. Sometimes the tide cycle just isn't going to fit a practical schedule. What you pick up south of the inlet coming north on the ebb, you often give up on the other side for a variety of reasons. I found the published stations to be more than adequate and I enjoyed the sport of navigation. If you can get lucky and hit it a bit before slack before flood, you can get a little slingshot effect. Myself, I just want to generally know how long it will take to get from point A to point be at a certain RPM, and if it is worth sleeping in or dawdling a little bit longer or getting up earlier. Most of the time, it doesn't matter for practical purposes; the sum of the day's tide shifts over a 40-60 mile stretch balance out. Unless of course I am going in or out an inlet (to/from the ocean where tide against the wind can really effect safe sea conditions as well as speed.
Depending on your draft and the dredging schedule, there are always some spots every year that may only be negotiable at mid to high tide. We've been known to truncate the day's cruise and anchor out waiting for safe water heights. Fortunately, it's gunk holer's heaven through there. A few times we liked the spot so much we stayed there a few more unplanned days. Cruising at it's finest!
"There's the Right Way, the Wrong Way, and what some guy says he's gotten away with"